Railway-gate



v(No Model.)

A. J. MGDONALD.

RAILWAY GATE. No. 404,724.

Patented June 4, 1889.

N. PETERS. PhuwLilhngnphu. .wanhingnm nc.

UNITED STATES ATnNT @nmol-3.

ALEXANDER J. MCDONALD, OF CHICAGQILLINOIS.

RAI LWAY-GTE.

SPECIFICATION forming part of Letters Patent No. 404,724, dated June 4, 1889.

l Application filed J'uly l0, 1888. Serial No. 279,562. (No model.) v

To all whom t may concern,.-

Be it known that I, ALEXANDER J. MC-

DONALD, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Railway-Gates, of which the following is a specification. v My invention relates to certain improvements in railway-gates wherein the swinging arms are connected or tied to each other by underground cables, by means of which both gates are simultaneously operated from a single power-engine; and my invent-ion consists in providing hinged casingsfor the metallic tie-rods or anchors, whereby the contraction or expansion of said rods, owing to changes of temperature, may be compensated for and a uniform movement and operation of the gates secured under all condit-ions.

In the accompanying drawings, Figure 1 is a vertical section through the posts of swinging railway-arms, shown in side elevation, and showing', also in side elevation, other parts connected to said swinging arms and the conduits for the cables. Fig. 2 is a plan view of the lower portion of one of the gate-posts,

and showing therein certain of the operating parts. Figs. 3 and 4 are views in side elevation of a combined sheave-covering and cableguard, which is shown provided with a hinge in Fig. 3 near its upper end, and in Fig. 4 midway of its vertical height, whereby it is adapted to-be pivotally secured to a fixed part of the gate., Fig. 5 is a view in elevation, partly in vertical section, through the sheave-covering and cable-guard, the sheave being shown partly in section,located within the lower portion of the structure. Fig. 6 is a vertical section transversely of the cableguard and throughv the sheave-guard and sheave. Fig. 7 is a detail showing a method of carrying the cable-conduits across the street.

In the drawings, 8 represents one of the gate-posts upon which the pivoted gate-arm 9 is supported. 10 is the rock-shaft for said pivoted arm; 11, a cross-bar secured rigidly midway of its length to the rock-shaft 10. Cables 12 13 are connected to the respective ends of the cross-bar 11, and are carried under sheavessuch as 16, Figs. 5 and G-located below the gate-post, and are thence conducted through conduits, which may be iron tubes or pipes 14 15, across the street around other sheaves located below a gatepost 8, and thence upward, where they are secured to the respective ends of a cross-bar 11, which in turn is fixed upon the rock-shaft 10, and to which rock-shaft is secured a second gatearm 9a.

It will beunderstood that the parts above described are duplicated on either side of the street.

XVithin the gate-post S and toward its bottom is located a power-cylinder 17, the piston of which operates through a suitable connecting medium to rock the shaft 18, and with it cross-bar 19, and this latter is connected by the links 20 with the cross-bar 1]., whereby movement is imparted to the gate-arm 9, and by means of the cables 12 13 to the gatearm 9a.

The metallic conduits 14 15 may be of gaspipe, and are preferably connected by screwthreads, as shown in Fig. 5, to a casting 2l, which is hollowed out to receive the sheaves 16. This casting 21 has a removable face 22, which is secured by bolts 23, and thereby the removal and insertion of the sheaves 16 are readily effected. These sheaves are located below the level of the surface of the pavement, and therefore are subject, as before mentioned, to be entirely surrounded by the water which collects in the pit beneath the gate-post. I therefore employ this closed sheave-guard, and prefer to use a packing at the joint between the removable face 22 and the stationary portion 21 to prevent water from entering. The sheaVe-guards have an upwardly-extending projection in the form of a hollow casting 23, with, preferably,.a flaring mouth 24 so far above the level of the pavement that all danger of water inding" ingress to the cable and sheaves is obviated. It will thus be seen that acontinuous conduit is provided by the pipes 14 15 and sheavecoverings and extensions 23a, so that the cable and sheaves 16 are entirely protected from water.

To compensate for the shortening of the pipes 14 15 by contraction and for their lengthening by expansion, owing to changes IOO in temperature, I hin the extensions 23 and the shem'e-eovering to one of the gate-posts. This may be done as shown either in Fig. 3 or in Fig. l', in both of which 2S represents the hinge, und 29 a fixed pzutot' the gute-post structure. A slight movement of these parts, due to the expansion or contraction of the metallic conduits 1l l5, is permitted by the hinge 2S without affecting the operation oli' the cables 12 13 or the joints and connections, und by the use of these hinged parts the uniform operation of the gntemrms is secured. It may be `found expedient to lill the sheavecoverings and the conduits ll l5 with oil io secure the Constantlubriouti011 of the sh eaves und enibles. Fig. 7 illustrates the method of laying the eonduiis il l5 in the street, ln

said figure, 25 represents t timber laid as foundation for paving-blocks 26, resting upon said timber. The timber Q5 is elmnneled, its at 27, and the pipes 1l 15 are laid in sil-id channel.

I Claim- In a ruilwuygaite, the Combination, with :L fixed part ofthe gute structure, of a cable guard 0r Covering hinged thereto and adapted to support a sheuve for the euble, und a Conduitpipe Connected rigidly to said guard or Covering, substantially as described.

ALEXANDER J. MCDONALD.

\\`Vitnesses:

C. C. LIN'rHioml, T. l). IEUfrLEi-L 

